填空题 The clock, however, can be affected by serotonin in different ways, depending on the point in the cell's daily cycle.

1、

【正确答案】 1、Y

【答案解析】文中倒数第二段首句“studies have found that serotonin affects the clock in different ways， depending on the point in the cell's daily cycle．”由此可知本题答案为“Y”。